This directory combines historical reference rows with separately labelled national sources. Read the source title, observation date, printed units and conditions on each entry. National source observations do not establish all measures applicable to a shipment.

United States Customs Tariff for HS Code 293399

Heterocyclic compounds; n.e.c. in headings no. 2933

USITC 2026 HTS Revision 19

26,806 official source entries are searchable. Checked 2026-09-22; edition published 2026-09-15.

Printed tariff and statistical lines from this edition, separate from historical WITS averages. Blank duty cells are not a confirmed zero. Review the parent tariff line, general and chapter notes, chapter 99, origin, exclusions, quotas and additional duties. No shipment total or special-rate eligibility is calculated. The edition publication date is not a line-level effective date.

Official schedule and source documentation

Official entries matching 293399

2933.99.01.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic:

Butyl (R)-2-[4-(5-trifluoromethyl-2- pyridinyloxy)phenoxy]propanoate

Source units: kg

Column 1 — General: Free
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: 15.4¢/kg + 50%

Official source for this code

2933.99.02.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic:

2-[4-[(6-Chloro-2-quinoxalinyl)oxy]phenoxy]- propionic acid, ethyl ester

Source units: kg

Column 1 — General: Free
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: 15.4¢/kg + 64.5%

Official source for this code

2933.99.05.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic:

Acridine and indole

Source units: kg

Column 1 — General: Free
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: Free

Official source for this code

2933.99.06.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic:

α-Butyl-α-(4-chlorophenyl)-1H-1,2,4- triazole-1- propanenitrile (Myclobutanil); andα-[2-(4-Chlorophenyl)ethyl]-α-phenyl-1H- 1,2,4-triazole-1-propanenitrile (Fenbuconazole)

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 64.5%

Official source for this code

2933.99.08.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic:

Aceto acetyl-5-amino benz imidazolone; 3-(2H-Benzo triazol-2-yl)-5-(tert-butyl)-4- hydroxy benzene propanoic acid, C7-C9 branched or linear alkyl esters; 2-(2H-Benzotriazol-2-yl)-6-dodecyl-4- methyl phenol, in liquid form, branched and linear; and 1,3,3-Trimethyl-2-methyleneindoline

Source units: kg

Column 1 — General: Free
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: 15.4¢/kg + 52%

Official source for this code

2933.99.11.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic:

Carbazole

Source units: kg

Column 1 — General: Free
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: 15.4¢/kg + 39.5%

Official source for this code

2933.99.12.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic:

6-Bromo-5-methyl-1H-imidazo[4,5-b]- pyridine; 2-sec-Butyl-4-tert-butyl-6-(benzotriazol-2- yl)phenol; 2-tert-Butyl-4-methyl-6-(5-chlorobenzotri- azol-2-yl)phenol; 2,4-Di-tert-butyl-6-(benzotriazol-2-yl)phenol; 2,4-Di-tert-butyl-6-(5-chlorobenzotriazol-2- yl)phenol; 2,3-Dichloro-6-quinoxalinecarbonyl chloride; 1-Hydroxy-2-carbazolecarboxylic acid; 2-Hydroxy-3-carbazolecarboxylic acid; 2-Hydroxy-3-carbazolecarboxylic acid, sodium salt; Iminodibenzyl(10,11-dihydro-5H-dibenz- [b,f]azepine); Indoline; 3-Methylbenzo[f]quinoline; 2-Methylindoline; 2-Methylmercaptobenzimidazole; 1-Methyl-2-phenylindole; 1-Methylpyrazine; 2,4-Methylpyrazolic acid; 2-Phenylbenzimidazole; 2-Phenylindole; Tetramethylpyrazine; 2,3,5-Triphenyltetrazolium chloride;dl-Tryptophan; and Vinylcarbazole, monomer

Source units: kg

Column 1 — General: 5.8%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 39.5%

Official source for this code

2933.99.14.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Pesticides:

5-Amino-4-chloro-α-phenyl-3- pyridazinone

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 40.5%

Official source for this code

2933.99.16.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Pesticides:

o-Diquat dibromide (1,1'-Ethylene- 2,2'-dipyridylium dibromide)

Source units: kg

Column 1 — General: Free
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: 15.4¢/kg + 40.5%

Official source for this code

2933.99.17.01

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Pesticides: › Other:

Insecticides

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 64.5%

Official source for this code

2933.99.22.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Pesticides: › Other:

Other

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,L,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 64.5%

Official source for this code

2933.99.24.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other:

Photographic chemicals

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 50%

Official source for this code

2933.99.26.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs:

Antihistamines

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 45%

Official source for this code

2933.99.42.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Anti-infective agents:

Acriflavine; Acriflavine hydrochloride; Carbadox; and Pyrazinamide

Source units: kg

Column 1 — General: Free
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: 15.4¢/kg + 46%

Official source for this code

2933.99.46.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Anti-infective agents:

Other

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 67.5%

Official source for this code

2933.99.51.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Cardiovascular drugs:

Hydralazine hydrochloride

Source units: kg

Column 1 — General: Free
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: 15.4¢/kg + 47.5%

Official source for this code

2933.99.53.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Cardiovascular drugs:

Other

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 65%

Official source for this code

2933.99.55

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Drugs primarily affecting the central nervous system:

Analgesics, antipyretics and nonhormonal anti-inflammatory agents

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg +47.5%

Official source for this code

2933.99.55.10

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Drugs primarily affecting the central nervous system: › Analgesics, antipyretics and nonhormonal anti-inflammatory agents

Tolmetin

Source units: kg

Column 1 — General: No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: No amount printed on this row; not a confirmed zero.

Parent tariff line 2933.99.55 — read its printed duties and notes

Analgesics, antipyretics and nonhormonal anti-inflammatory agents

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg +47.5%

Open parent line in the official schedule

Official source for this code

2933.99.55.20

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Drugs primarily affecting the central nervous system: › Analgesics, antipyretics and nonhormonal anti-inflammatory agents

Tolmetin sodium dihydrate

Source units: kg

Column 1 — General: No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: No amount printed on this row; not a confirmed zero.

Parent tariff line 2933.99.55 — read its printed duties and notes

Analgesics, antipyretics and nonhormonal anti-inflammatory agents

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg +47.5%

Open parent line in the official schedule

Official source for this code

2933.99.55.30

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Drugs primarily affecting the central nervous system: › Analgesics, antipyretics and nonhormonal anti-inflammatory agents

Tolmetin sodium (anhydrous)

Source units: kg

Column 1 — General: No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: No amount printed on this row; not a confirmed zero.

Parent tariff line 2933.99.55 — read its printed duties and notes

Analgesics, antipyretics and nonhormonal anti-inflammatory agents

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg +47.5%

Open parent line in the official schedule

Official source for this code

2933.99.55.90

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Drugs primarily affecting the central nervous system: › Analgesics, antipyretics and nonhormonal anti-inflammatory agents

Other

Source units: kg

Column 1 — General: No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: No amount printed on this row; not a confirmed zero.

Parent tariff line 2933.99.55 — read its printed duties and notes

Analgesics, antipyretics and nonhormonal anti-inflammatory agents

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg +47.5%

Open parent line in the official schedule

Official source for this code

2933.99.58.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Drugs primarily affecting the central nervous system: › Antidepressants, tranquilizers and other psychotherapeutic agents:

Droperidol; and Imipramine hydrochloride

Source units: kg

Column 1 — General: Free
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: 15.4¢/kg + 45.5%

Official source for this code

2933.99.61.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Drugs primarily affecting the central nervous system: › Antidepressants, tranquilizers and other psychotherapeutic agents:

Other

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 149.5%

Official source for this code

2933.99.65.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Drugs primarily affecting the central nervous system:

Anticonvulsants, hypnotics and sedatives

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 48.5%

Official source for this code

2933.99.70.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs: › Drugs primarily affecting the central nervous system:

Other

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 58.5%

Official source for this code

2933.99.75.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Drugs:

Other

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 45%

Official source for this code

2933.99.79.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Other:

Products described in additional U.S. note 3 to section VI

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,L,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 52%

Official source for this code

2933.99.82

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Other:

Other

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,L,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 52%

Official source for this code

2933.99.82.10

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Other: › Other

Benzotriazole (CAS No. 95-14-7)

Source units: kg

Column 1 — General: No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: No amount printed on this row; not a confirmed zero.

Parent tariff line 2933.99.82 — read its printed duties and notes

Other

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,L,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 52%

Open parent line in the official schedule

Official source for this code

2933.99.82.20

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Other: › Other

Tolyltriazole (CAS No. 29385-43-1)

Source units: kg

Column 1 — General: No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: No amount printed on this row; not a confirmed zero.

Parent tariff line 2933.99.82 — read its printed duties and notes

Other

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,L,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 52%

Open parent line in the official schedule

Official source for this code

2933.99.82.90

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Aromatic or modified aromatic: › Other: › Other: › Other

Other

Source units: kg

Column 1 — General: No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: No amount printed on this row; not a confirmed zero.

Parent tariff line 2933.99.82 — read its printed duties and notes

Other

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,L,MA,OM,P,PA,PE,S,SG)
Column 2: 15.4¢/kg + 52%

Open parent line in the official schedule

Official source for this code

2933.99.85.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Other:

3-Amino-1,2,4-triazole

Source units: kg

Column 1 — General: 3.7%
Column 1 — Special (eligibility required): Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 25%

Official source for this code

2933.99.89.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Other:

Hexamethyleneimine

Source units: kg

Column 1 — General: Free
Column 1 — Special (eligibility required): No amount printed on this row; not a confirmed zero.
Column 2: 30.5%

Official source for this code

2933.99.90.00

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Other: › Other:

Drugs

Source units: kg

Column 1 — General: 3.7%
Column 1 — Special (eligibility required): Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)
Column 2: 25%

Official source for this code

2933.99.97.01

Heterocyclic compounds with nitrogen hetero-atom(s) only: › Other: › Other: › Other: › Other:

Other

Source units: kg

Column 1 — General: 6.5%
Column 1 — Special (eligibility required): Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,L,MA,OM,P,PA,PE,S,SG)
Column 2: 30.5%

Official source for this code

WITS 2023 historical MFN average

Reported average: 4.04137897491455%.

Source year: 2023. Classification: HS 2022 (H6). Checked 2026-09-14.

National lines included: 29 of 29. Excluded from the average: 0.

Reported ad-valorem range: 0%–6.5%.

Reported historical ad-valorem MFN simple average for 2023, not a national tariff schedule. No preferential rates, additional duties, VAT, excise or import permissions are determined.

Not a current 2026 national duty. The HS6 average does not determine the duty of a particular national subdivision, origin or shipment.

WITS observation for this code and year

UN Comtrade H6 descriptions (HS 2022)

WITS API definitions: reported averages and excluded national lines

Direct HS code answer for United States

United States HS Code 293399: 4.04% (2023 MFN average)

The source reports an indicative HS6 MFN average of 4.04% (2023 MFN average) for Heterocyclic compounds; n.e.c. in headings no. 2933.Source status: not assessed. Verify the exact national tariff line, origin treatment, taxes, restrictions, and current customs guidance before using this information in a declaration.

Browse chapter 29 Search parent HS 293399 Request import report

Customs tariff summary

Country: United States
HS / tariff code: 293399
Description: Heterocyclic compounds; n.e.c. in headings no. 2933
Chapter: 29 —
Heading: 2933
Subheading: 293399
Indicative MFN HS6 average: 4.04% (2023 MFN average)
VAT / tax: Check local VAT and excise rules for the import destination.
Unit / basis: Not listed in this tariff line
Source / vintage: WITS / UNCTAD TRAINS — 2023 MFN HS6 reference

Historical MFN average

4.04% (2023 MFN average)

Import permission

not assessed

Import planning

Need a landed cost report for this HS code?

Request a one-page research summary with source checks, landed-cost inputs, and points to verify for HS code 293399 in United States.

Details

HS Code: 293399
Chapter: 29 —
Heading: 2933
Subheading: 293399

Compare HS code 293399 across GCC countries

Each destination shows its own source label. Oman uses its national schedule; Qatar and UAE entries may cite their separately published references and unresolved exceptions. Other entries retain the historical GCC reference. National codes, duty notes, restrictions and tax treatment can differ; verify with the destination customs authority.

Saudi ArabiaSearch parent HS 293399 United Arab EmiratesSearch parent HS 293399 OmanSearch parent HS 293399 QatarSearch parent HS 293399 KuwaitSearch parent HS 293399 BahrainSearch parent HS 293399

Related HS Codes (Heading 2933)

HS Code	Description	Duty
293311	Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused pyrazole ring (whether or not hydrogenated) in the structure, phenazone (antipyrin) and its derivatives	6.50% (2023 MFN average)WITS 2023 historical MFN average
293319	Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused pyrazole ring (whether or not hydrogenated) in the structure, other than henazone (antipyrin) and its derivatives	4.04% (2023 MFN average)WITS 2023 historical MFN average
293321	Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused imidazole ring (whether or not hydrogenated) in the structure, hydantoin and its derivatives	6.50% (2023 MFN average)WITS 2023 historical MFN average
293329	Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused imidazole ring (whether or not hydrogenated) in the structure, other than hydantoin and its derivatives	4.38% (2023 MFN average)WITS 2023 historical MFN average
293331	Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, pyridine and its salts	0.00% (2023 MFN average)WITS 2023 historical MFN average
293332	Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, piperidine and its salts	6.50% (2023 MFN average)WITS 2023 historical MFN average
293333	Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, alfentanil (INN), anileridine (INN), bezitramide (INN), bromazepam (INN), carfentanil (INN), difenoxin (INN), diphenoxylate (INN), dipipanone (INN)	0.00% (2023 MFN average)WITS 2023 historical MFN average
293334	Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, other fentanyls and their derivatives	6.50% (2023 MFN average)WITS 2023 historical MFN average
293335	Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, 3-quinuclidinol	5.80% (2023 MFN average)WITS 2023 historical MFN average
293336	Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, 4-anilino-N-phenethylpiperidine (ANPP)	6.50% (2023 MFN average)WITS 2023 historical MFN average
293337	Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, N-phenethyl-4-piperdone (NPP)	6.50% (2023 MFN average)WITS 2023 historical MFN average
293339	Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, n.e.c. in 2933.3	5.25% (2023 MFN average)WITS 2023 historical MFN average
293341	Heterocyclic compounds; containing a quinoline or isoquinoline ring-system (whether or not hydrogenated) in the structure, not further fused, levorphanol (INN) and its salts	0.00% (2023 MFN average)WITS 2023 historical MFN average
293349	Heterocyclic compounds; containing a quinoline or isoquinoline ring-system (whether or not hydrogenated) in the structure, not further fused, other than levorphanol (INN) and its salts	5.70% (2023 MFN average)WITS 2023 historical MFN average
293352	Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, malonylurea (barbituric acid) and its salts	0.00% (2023 MFN average)WITS 2023 historical MFN average
293353	Allobarbital (INN), amobarbital (INN), barbital (INN), butalbital (INN), butobarbital, cyclobarbital (INN), methylphenobarbital (INN), pentobarbital (INN), phenobarbital (INN), secbutabarbital (INN), secobarbital (INN) and vinylbital (INN); salts thereof	0.00% (2023 MFN average)WITS 2023 historical MFN average
293354	Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, other derivatives of malonylurea (barbituric acid) and salts thereof, n.e.c. in 2933.53	3.70% (2023 MFN average)WITS 2023 historical MFN average
293355	Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure; loprazolam (INN), mecloqualone (INN), methaqualone (INN), and zipeprol (INN); salts thereof	0.00% (2023 MFN average)WITS 2023 historical MFN average
293359	Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, (other than malonylurea and its derivatives, loprazolam, mecloqualone, methaqualone, zipeprol, and salts thereof) n.e.c. in 2933.5	5.78% (2023 MFN average)WITS 2023 historical MFN average
293361	Heterocyclic compounds; containing an unfused triazine ring (whether or not hydrogenated) in the structure, melamine	3.50% (2023 MFN average)WITS 2023 historical MFN average

Data source: WITS/UNCTAD TRAINS (MFN 2022). Values are indicative HS6 MFN averages, not shipment-specific applied rates. Import permission and restrictions are not assessed. Historical reference rates exclude VAT, excise and other national measures. Separate national entries preserve the columns printed by their source; these are not a complete shipment assessment. Full disclaimer.